Add json structure editor

src/common/components/JsonEditor/JsonArray.vue

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+<template>
+  <div class="flex flex-column">
+    <div class="flex flex-row" @click="_expanded = !_expanded">
+      <div v-if="_value.key" class="item-key">
+        "{{_value.key}}" <b>:</b> 
+        <span v-if="!_expanded"><b> [</b> ... <b>]</b>,</span>
+        <template v-else><b>[</b></template>
+      </div>
+    </div>
+    <div v-for="(row, key) of _value.value"
+         :key="key"
+    >
+      <JsonArray v-if="Array.isArray(row)"
+                 value="{'key': key', 'value': row}"
+                 @change="changeItem(key, value)"
+      >
+      </JsonArray>
+      <JsonObject v-else-if="typeof row === 'object' && row !== null"
+                  value="{'key': key, 'value': row}"
+                  @change="changeItem(key, value)"
+      >
+      </JsonObject>
+      <JsonElement v-else
+                   value="{'key': key, 'value': row}"
+                   @change="changeItem(key, value)"
+      >
+      </JsonElement>
+    </div>
+    <div v-if="expanded"><b>],</b>
+  </div>
+</template>
+
+<script>
+import JsonObject from './JsonObject';
+import JsonElement from './JsonElement';
+
+export default {
+  name: 'JsonArray',
+  props: [
+    'value',
+    'expanded',
+  ],
+  components: {
+    JsonObject,
+    JsonElement,
+  },
+  data() {
+    return {
+      _value: undefined,
+      _expanded: true,
+    }
+  },
+  watch: {
+    value: function(val) {
+      this._value = val;
+    },
+    expanded: function(val) {
+      if (val !== undefined && val !== null) {
+        this._expanded = !!val;
+      }
+    }
+  },
+  methods: {
+    changeItem(key, value) {
+      this._value.value[key] = value;
+      this.$emit('change', this._value.value);
+    }
+  }
+}
+</script>

src/common/components/JsonEditor/JsonElement.vue

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+<template>
+  <div class="flex flex-row">
+    <div v-if="_value.key" class="item-key">
+      "{{_value.key}}" <b>:</b>
+    </div>
+    <div v-if="typeof _value.value === 'boolean'"
+         class="json-value-boolean"
+         @click="toggleBoolean"
+    >
+      <template v-if="_value.value">true</template>
+      <template v-else>false</template>
+    </div>
+    <div v-else
+        class="flex flex-row inline-edit"
+        :class="{
+          'json-value-number': typeof _value.value === 'number',
+          'json-value-string': typeof _value.value === 'string'
+        }"
+    >
+      <template v-if="editing">
+        <div ref="element-edit-area"
+             :contenteditable="editing"
+        >
+          {{_value.value}}
+        </div>
+        <div class="btn" @click="changeValue">
+          ✔
+        </div>
+      </template>
+      <template v-else>
+        <template v-if="typeof _value.value === 'string'">
+          "{{_value.value}}"
+        </template>
+        <template v-else>
+          {{_value.value}}
+        </template>
+      </template>
+    </div>
+  </div>
+</template>
+
+<script>
+export default {
+  name: 'json-element',
+  props: [
+    'value',
+  ],
+  data() {
+    return {
+      _value: undefined,
+      editing: false,
+    }
+  },
+  watch: {
+    value: function(val) {
+      this._value = val;
+    }
+  },
+  methods: {
+    toggleBoolean() {
+      this._value.value = !this._value.value;
+      this.$emit('change', this._value.value);
+    },
+    changeValue() {
+      const newValue = this.$refs['element-edit-area'].textContent;
+      if (isNaN(newValue)) {
+        this._value.value = newValue;
+        this.$emit('change', newValue);
+      } else {
+        this._value.value = +newValue;
+        this.$emit('change', +newValue);
+      }
+      this.editing = false;
+    }
+  }
+}
+</script>

src/common/components/JsonEditor/JsonObject.vue

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+<template>
+  <div class="flex flex-column">
+    <div class="flex flex-row" @click="_expanded = !_expanded">
+      <div v-if="_value.key" class="item-key">
+        "{{_value.key}}" <b>:</b> 
+        <span v-if="!_expanded"><b> {</b> ... <b>}</b>,</span>
+        <template v-else><b>{</b></template>
+      </div>
+    </div>
+    <div v-for="(row, key) of _value.value"
+         :key="key"
+    >
+      <JsonArray v-if="Array.isArray(row)"
+                 value="{'value': row}"
+                 @change="changeItem(key, value)"
+      >
+      </JsonArray>
+      <JsonObject v-else-if="typeof row === 'object' && row !== null"
+                  value="{'key': key, 'value': row}"
+                  @change="changeItem(key, value)"
+      >
+      </JsonObject>
+      <JsonElement v-else
+                   value="{'key': key, 'value': row}"
+                   @change="changeItem(key, value)"
+      >
+      </JsonElement>
+    </div>
+    <div v-if="expanded"><b>},</b>
+  </div>
+</template>
+
+<script>
+import JsonArray from './JsonArray';
+import JsonElement from './JsonElement';
+
+export default {
+  name: 'JsonObject',
+  props: [
+    'value',
+    'expanded',
+  ],
+  components: {
+    JsonArray,
+    JsonElement,
+  },
+  data() {
+    return {
+      _value: undefined,
+      _expanded: true,
+    }
+  },
+  watch: {
+    value: function(val) {
+      this._value = val;
+    },
+    expanded: function(val) {
+      if (val !== undefined && val !== null) {
+        this._expanded = !!val;
+      }
+    }
+  },
+  methods: {
+    changeItem(key, value) {
+      this._value.value[key] = value;
+      this.$emit('change', this._value.value);
+    }
+  }
+}
+</script>